The chairman of the Milk Control Commission of the Commonwealth of Pennsylvania is hereby designated and appointed as Milk Compact Commissioner, and vested with authority to confer with legally constituted authorities of other states and of the United States with respect to uniform milk control, as applying to milk delivered to plants which are, or may hereafter become, approved by any health authority as sources of milk for New York City, and the counties of Westchester, Suffolk or Nassau in the State of New York. Said Milk Compact Commissioner is hereby authorized to confer and negotiate with, and to enter into an agreement or interstate compact with, such authorities of New York, New Jersey and Vermont and Massachusetts, if it chooses to join to provide for the uniform regulation of the price to be paid producers for such milk, subject to such federal consent as may be required by law. The Milk Compact Commissioner may if such compact shall so provide, become a member of any authority or commission created by such compact for the purpose of conducting investigations, securing information, holding hearings, fixing prices and issuing orders, rules and regulations.